title: Evidence for male XO sex-chromosome system in Pentodon bidens punctatum (Coleoptera Scarabaeoidea: Scarabaeidae) with X-linked 18S-28S rDNA clusters.
mesh_terms: D000818:Animals; D002871:Chromosome Banding; D001517:Coleoptera / Q000235:genetics*; D005260:Female; D006570:Heterochromatin / Q000235:genetics*; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008297:Male; D012730:Sex Chromosomes / Q000235:genetics*
chemical_list: D006570:Heterochromatin